I've read that the GeForce GTX 970 4GB actually is 3.5GB and some users have said the remaining half gigabyte runs 80 percent slower than it's supposed to. That can cause images to stutter on a high resolution screen and some games to perform poorly..
Is this something to worry about? I would imagine The Witcher 3 would want to use the whole 4GB if you want that extra good graphics?
Sometimes the Internet confuses me. But I google and this was said in February or something.
it's true, i have a gtx 970 and always when the vram usage surpasses the 3,4 or 3,5 or 3,6 the game stutters and freezes, the fps drops like hell
so all game settings must be set up to use less than 3,5 gb even when reaching 3 gb usage the fps drops from 60 (or more) to 40, 30, 20
if tw3 need full 4gb to maximum settings or something, you'll have t set settings on medium , msaa must be deactivated, it also depends which resolution you use
but if the recommended gpu has 2 gb vram, i don't see why the game requires 4 gb
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